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TABLE 1—DRIL-FLEX SELF-DRILLING STRUCTURAL SCREWS <br />SCREW <br />TYPE <br />DESCRIPTION <br />(nominal size and tpi) <br />NOMINAL <br />DIAMETER <br />(inch) <br />HEAD <br />STYLE1 <br />HEX DRIVE <br />SIZE (INCH) / <br />PHILLIPS SIZE <br />NOMINAL <br />HEAD <br />DIAMETER <br />POINT <br />TYPE <br />CAPACITY2 MINIMUM <br />REQUIRED <br />PROTRUSION3 <br />1 #10-16 0.190 PPH 2 0.365 #2 0.048 0.110 0.406 <br />2A #10-16 0.190 HWH 5/16 0.400 #3 0.048 0.150 0.500 <br />2B #10-16 0.190 HWH 5/16 0.415 #3 0.048 0.150 0.500 <br />3 #10-24 0.190 PWH 2 0.470 #3 0.048 0.150 0.468 <br />4 #12-14 0.216 HWH 5/16 0.500 #2 0.048 0.110 0.625 <br />5 #12-14 0.216 HWH 5/16 0.415 #3 0.048 0.187 0.500 <br />6 #12-14 0.216 PUFH 3 0.415 #3 0.048 0.187 0.500 <br />7 #12-24 0.216 HWH 5/16 0.415 #5 0.048 0.500 1.000 <br />8 1/4-14 0.250 HWH 3/8 0.500 #3 0.048 0.210 0.563 <br />9 1/4-20 0.250 HWH 3/8 0.500 #4 0.060 0.312 0.813 <br />10 1/4-20 0.250 HWH 3/8 0.500 #5 0.060 0.500 1.000 <br />11 5/16-18 0.313 HWH 3/8 0.600 #3 0.096 0.210 0.750 <br />12A 5/16-24 0.313 HWH 3/8 0.600 #4 0.105 0.312 0.813 <br />12B 5/16-24 0.313 HWH 3/8 0.600 #4 0.105 0.312 0.813 <br />For SI: 1 inch = 25.4 mm. <br />1Head styles: HWH = Hex Washer Head; PPH = Phillips Pan Head; PWH = Phillips Wafer Head; PUFH = Phillips Undercut Flat Head. <br />2 The drilling capacity of a screw refers to minimum and maximum thickness of the steel that the screw is designed to drill through. <br />3Maximum load bearing length can be calculated by subtracting the minimum required protrusion from the nominal length of the screw. <br /> <br /> <br /> <br /> <br />TABLE 2—SCREW SHEAR AND TENSION STRENGTH, pounds-force1,2,3 <br />SCREW TYPE SCREW <br />SIZE <br />HEAD <br />STYLE4 Ω=3 Φ=0.5 <br />/Ω/ΩΦ Tension, Φ <br />1 #10-16 PPH 1526 2273 509 758 763 1136 <br />2A, 2B #10-16 HWH 1463 2276 488 759 732 1138 <br />3 #10-24 PWH 1080 2613 360 871 540 1307 <br />4, 5 #12-14 HWH 1992 3216 664 1072 996 1608 <br />6 #12-14 PUFH 1980 2149 660 716 990 1075 <br />7 #12-24 HWH 1904 3254 644 1085 967 1627 <br />8 1/4-14 HWH 2692 4363 897 1454 1346 2182 <br />9, 10 1/4-20 HWH 2617 4359 872 1453 1308 2179 <br />11 5/16-18 HWH 4568 7222 1523 2407 2284 3611 <br />12A, 12B 5/16-24 HWH 4960 8757 1653 2919 2480 4379 <br />For SI: 1 inch = 25.4 mm, 1 lbf = 4.4 N. <br />1For tension connections, the lower of the available screw tension strength, pullover strength, and pull-out strength found in Tables 2, 4 and 5, respectively, must be <br />used for design. <br />2For shear connections, the lower of the available screw shear strength and the allowable shear (bearing) capacity found in Tables 2 and 3, respectively, must be used <br />for design. <br />3Nominal strengths are based on laboratory tests. <br />4Head styles: HWH = Hex Washer Head; PPH = Phillips Pan Head; PWH = Phillips Wafer Head; PUFH = Phillips Undercut Flat Head. <br /> <br /> <br /> <br />11